baseband-devel February 2013

baseband-devel@lists.osmocom.org

32 participants
38 discussions

is the Viterbi decode for the AFS provided by Sylvain right?
by bob 23 Feb '13

23 Feb '13

Hi ,List: search some materials, find that the decode method of AFS convolutional code is different from the EFS`, it use RSC, and need SOVA(soft output viterbi algorithm). am i right? -- View this message in context: http://baseband-devel.722152.n3.nabble.com/is-the-Viterbi-decode-for-the-AF… Sent from the baseband-devel mailing list archive at Nabble.com.

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Trouble in making CALL
by cris crazy 21 Feb '13

21 Feb '13

Hi all, I am facing an error while trying to make a call from vty here is my mobile.cfg output ! ! OsmocomBB () configuration saved from vty !! ! line vty no login ! gps device /dev/ttyACM0 gps baudrate default gps enable ! no hide-default ! ms 1 layer2-socket /tmp/osmocom_l2 sap-socket /tmp/osmocom_sap sim reader network-selection-mode auto imei 415239521974659 0 imei-random 15 no emergency-imsi no sms-service-center no call-waiting no auto-answer no force-rekey clip no clir tx-power auto no simulated-delay no stick location-updating neighbour-measurement codec full-speed prefer codec half-speed no abbrev support sms a5/1 a5/2 p-gsm e-gsm r-gsm no gsm-850 dcs no pcs class-900 4 class-850 4 class-dcs 1 class-pcs 1 channel-capability sdcch+tchf+tchh full-speech-v1 full-speech-v2 half-speech-v1 min-rxlev -100 dsc-max 90 no skip-max-per-band exit test-sim imsi 001010000000000 ki xor 00 00 00 00 00 00 00 00 00 00 00 00 no barred-access no rplmn hplmn-search foreign-country exit no shutdown exit ! the debbuging output is <0009> mnccms.c:570 Make call to 123456789 <0009> mnccms.c:150 support TCH/H also <0009> mnccms.c:174 support full rate v2 <0009> mnccms.c:178 support full rate v1 <0009> mnccms.c:187 support half rate v1 <0006> transaction.c:76 ms 1 allocates transaction (proto 3 trans_id 255 callref 1 mem 0xf408d0) <0006> gsm48_cc.c:243 new state NULL -> MM_CONNECTION_PEND <0006> gsm48_cc.c:507 Sending MMCC_EST_REQ <0005> gsm48_mm.c:3783 (ms 1) Received 'MMCC_EST_REQ' event in state MM idle <0005> gsm48_mm.c:3786 -> substate PLMN search <0005> gsm48_mm.c:3788 -> callref 1, transaction_id 255 <0005> gsm48_mm.c:3051 Init MM Connection, not in normal state. <0006> gsm48_cc.c:2161 (ms 1) Received 'MMCC_REL_IND' in CC state MM_CONNECTION_PEND <0006> gsm48_cc.c:196 (ms 1 ti ff) Sending 'MNCC_REL_IND' to MNCC. <0006> gsm48_cc.c:243 new state MM_CONNECTION_PEND -> NULL <0006> transaction.c:104 ms 1 frees transaction (mem 0xf408d0) <0009> mnccms.c:372 Call has been released (cause 21) <0009> mnccms.c:71 (call 1) Call removed. and also my ms output from vty OsmocomBB> enable OsmocomBB# show ms MS '1' is up, service is limited IMEI: 418873812577882 IMEISV: 4188738125778820 IMEI generation: random (15 trailing digits) automatic network selection state: A0 null cell selection state: C0 null radio ressource layer state: idle mobility management layer state: MM idle, PLMN search OsmocomBB# show subsccriber 1 % Unknown command. OsmocomBB# show sub OsmocomBB# show subscriber 1 OsmocomBB# show subscriber 1 Mobile Subscriber of MS '1': IMSI: 405025012498239 ICCID: 89910255110124982391 Status: U1_UPDATED IMSI detached TMSI 0x1d315a07 LAI: MCC 405 MNC 025 LAC 0x42d8 (405, TATA DOCOMO) Key: sequence 2 a6 78 30 12 22 45 0b 03 Access barred cells: no Access classes: Kindly assist me with some suggestions. Regards, Cris

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Can't get arm toolchain
by Alexander Schwankner 21 Feb '13

21 Feb '13

*Dear folks,* Recently I tried to compile osmocomBB on ubuntu 120.10 and arch linux. I always run into problems trying to get the arm toolchain. I can't reach gnuarch.com because it is down, nor get the paket from the ubuntu ppa because it is also down or corrupted. Is there any other source where I can get the arm toolchain or any howto wich could help me? Thanks :)

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osmocombb and raspberry pi
by tom jerry 20 Feb '13

20 Feb '13

hi everyone.is it possible to connect motorola c118 to the raspberry GPIO pins,since they are 3v3 logic? What is the current limitation as the GPIO pins can provide only 8mA? Is it possible to use the lcd of the c118 or the RTC on the raspberry pi via the GPIO pins? Can i use the connection via the GPIO Instead of the pl2303 based cable. Thanks.

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Can't get arm toolchain
by Alexander Schwankner 18 Feb '13

18 Feb '13

1 0

reference to TS 08.05
by Bhaskar11 16 Feb '13

16 Feb '13

The code for rxlev2dbm refers to TS 08.05 Chapter 8.1.4, but TS 08.05 is now marked as "withdrawn". Can you please point me to the correct reference for this? Thx.

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OsmocomBB Mobile Call Setup Weird behaviour
by dagar 15 Feb '13

15 Feb '13

OK am testing the mobile app with C123 using real sim but getting some odd behaviour (have tested with main branch & sylvian testing branch and results have been similar to this) The results below are from using sylvian testing branch build as described here http://bb.osmocom.org/trac/wiki/SIMReader <http://bb.osmocom.org/trac/wiki/SIMReader> config tx is enabled etc I can download the layer1 firmware to the phone ok - mobile app seems to run ok aswell but when I try to make a call or sms this is where there's some odd behaviour . On my first attempt to make a call I can hear the call trying to be made but an automated message is played saying I have dialed an incorrect number (this normally happens if the number is dialed in an incorrect format) In previous attempts I have tried all the formats I can think of but have never been able to get a successful call to go through as of yet but if I dial it through the phone (without osmocom) normally everything works fine.. 07780000000 +447780000000 447780000000 00447780000000 Usually after the first call the phone then mysteriously deregisters from the network there is no service and when I restart osmocon/mobile etc I still cannot register on the network it just keeps scannning frequenceies and failing to connect with the network. On my first osmocon log when i managed to connect to the network after the call was released there were alot of DSP Error Status: 32 messages and then no service. I have gone through the logs but I still can't figure out why a) the call is failing to go through correctly b) why it seems like I get kicked of the network if I try to make a call Here are my full outputs 1ST ATTEMPT - MANAGED TO PLACE CALL THEN CONNECTION DROPPED Osmocon output - https://www.box.com/s/xdqi7azezprf4g7erz9h <https://www.box.com/s/xdqi7azezprf4g7erz9h> Mobile output - https://www.box.com/s/gqcdas9eqso0nchat011 <https://www.box.com/s/gqcdas9eqso0nchat011> Telnet output - https://www.box.com/s/lcazgabtmous0xheklmc <https://www.box.com/s/lcazgabtmous0xheklmc> 2ND ATTEMPT - FAILED TO CONNECT Osmocon output - https://www.box.com/s/c42vi7ows8p14h0hr45m <https://www.box.com/s/c42vi7ows8p14h0hr45m> Mobile output - https://www.box.com/s/eqygysqommur46ywgqrs <https://www.box.com/s/eqygysqommur46ywgqrs> Telnet output - https://www.box.com/s/kmympl0g0l8zb3xjyu8d <https://www.box.com/s/kmympl0g0l8zb3xjyu8d> 3RD ATTEMPT - FAILED TO CONNECT Osmocon output - https://www.box.com/s/gb9aw9p05pqy1v5fpxke <https://www.box.com/s/gb9aw9p05pqy1v5fpxke> Mobile output - https://www.box.com/s/llo751tuvvu1p5v31eur <https://www.box.com/s/llo751tuvvu1p5v31eur> Telnet output - https://www.box.com/s/t8e63lqrad87f35uylge <https://www.box.com/s/t8e63lqrad87f35uylge> Extract from telnet OsmocomBB# % (MS 1) % Trying to registering with network... % (MS 1) % On Network, normal service: Guernsey, T-Mobile show ms MS '1' is up, service is normal IMEI: 35972800609#### IMEISV: 359728006093#### IMEI generation: fixed automatic network selection state: A2 on PLMN MCC=234 MNC=30 (Guernsey, T-Mobile) cell selection state: C3 camped normally ARFCN=628(DCS) MCC=234 MNC=30 LAC=0x084f CELLID=0xf65d (Guernsey, T-Mobile) radio ressource layer state: idle mobility management layer state: MM idle, normal service OsmocomBB# call 1 +44772228#### OsmocomBB# % (MS 1) % Call has been released % (MS 1) % On Network, normal service: Guernsey, T-Mobile call 1 +44772228#### % (MS 1) % Searching network... show ms % (MS 1) % On Network, normal service: Guernsey, T-Mobile call 1 44772228#### OsmocomBB# % (MS 1) % Call is proceeding % (MS 1) % Call is alerting % (MS 1) % Call: Remote hangs up % (MS 1) % Trying to registering with network... % (MS 1) % Trying to registering with network... % (MS 1) % Searching network... % (MS 1) % No service. % (MS 1) % Power off! CALL SETUP EXTRACT FROM 1ST MOBILE APP OUTPUT -- View this message in context: http://baseband-devel.722152.n3.nabble.com/OsmocomBB-Mobile-Call-Setup-Weir… Sent from the baseband-devel mailing list archive at Nabble.com.

2 2

Sniffing to RACH
by Akib Sayyed 14 Feb '13

14 Feb '13

Hello list I am trying to sniff TS0 of BTS for purpose of sniffing RACH. but i am bit confused in this. i attached my code in mail. short description: 1. changed IMM_ASS to single RF and allow to jump as per IMM_ASS only once and no Hoppoing 2. while jumping to single RF imm ass used chan_nr=40 (40 & 7 =0) 3. added own function for decoding ccch. current problem able to decode PCH and AGCH properly but its slow in action. but if i use following modification in mframe_sched.c static const struct mframe_sched_item mf_ccch[] = { { .sched_set = SNIFF_QUAD_DL, .modulo = 51, .frame_nr = 6 }, { .sched_set = SNIFF_QUAD_UL, .modulo = 51, .frame_nr = 6 +15 }, { .sched_set = SNIFF_QUAD_DL, .modulo = 51, .frame_nr = 12}, { .sched_set = SNIFF_QUAD_UL, .modulo = 51, .frame_nr = 12 +15}, { .sched_set = SNIFF_QUAD_DL, .modulo = 51, .frame_nr = 16 }, { .sched_set = SNIFF_QUAD_UL, .modulo = 51, .frame_nr = 16 +15}, { .sched_set = SNIFF_QUAD_DL, .modulo = 51, .frame_nr = 22 }, { .sched_set = SNIFF_QUAD_UL, .modulo = 51, .frame_nr = 22 +15}, { .sched_set = SNIFF_QUAD_DL, .modulo = 51, .frame_nr = 26 }, { .sched_set = SNIFF_QUAD_UL, .modulo = 51, .frame_nr = 26+15 }, { .sched_set = SNIFF_QUAD_DL, .modulo = 51, .frame_nr = 32 }, { .sched_set = SNIFF_QUAD_UL, .modulo = 51, .frame_nr = 32 +15}, { .sched_set = SNIFF_QUAD_DL, .modulo = 51, .frame_nr = 36 }, { .sched_set = SNIFF_QUAD_UL, .modulo = 51, .frame_nr = 36 +15}, { .sched_set = SNIFF_QUAD_DL, .modulo = 51, .frame_nr = 42 }, { .sched_set = SNIFF_QUAD_UL, .modulo = 51, .frame_nr = 42 +15}, { .sched_set = SNIFF_QUAD_DL, .modulo = 51, .frame_nr = 46 }, { .sched_set = SNIFF_QUAD_UL, .modulo = 51, .frame_nr = 46 +15}, { .sched_set = NULL } }; it becomes very faster but I am not sure whether its correct or will give me correct out put. -- Akib Sayyed Matrix-Shell akibsayyed(a)gmail.com akibsayyed(a)matrixshell.com Mob:- +91-966-514-2243

1 0

Structure of traffic data in burst_ind messages
by Bhaskar11 12 Feb '13

12 Feb '13

I'm experimenting with burst-ind branch and am able to track control messages in ccch_scan. I then send an Assignment Command to change to a traffic channel. I can see the bursts come in, but cannot make out the format of the data. If I understand right, the burst_ind structure holds 15 bytes of data, but the traffic data should be 33 bytes. I assume the traffic data is spread across several burst-ind messages. Can you please clarify how to re-assemble the full 33-byte traffic data structure from the burst_ind messages? Thanks. B.

3 13

Problem with softbits in osmo_ubit2pbit()
by Bhaskar11 12 Feb '13

12 Feb '13

While playing with ccch_scan, I came across a strange problem. At some point the code uses: /* Convert to softbits */ for (i=0; i<116; i++) bursts[(116*bid)+i] = bt[i] ? - (bi->snr >> 1) : (bi->snr >> 1); After this, "xcch_decode()" works ok and "osmo_ubit2pbit_ext()" also works ok. But "osmo_ubit2pbit()" fails as it converts almost all softbits to 0xFF. Is this a bug or a "feature"? Do we need to recode "osmo_ubit2pbit" so that its bit-checking is more robust as in "osmo_ubit2pbit_ext"? Sylvain, can you explain the idea of using softbits instead of hard binary? Is it for GSMTAP to represent signal strength? Thanks in advance for your help. B

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baseband-devel February 2013